| Original Articles |
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Temperature-Strain Discrimination Sensor Using a WDM Chirped in-Fibre Bragg Grating and an Extrinsic Fabry-Pérot |
| RAO Yun-Jiang1;ZENG Xiang-Kai1;ZHU Yong1;WANG Yi-Ping1;ZHU Tao1;RAN Zeng-Ling1;ZHANG Lin2;IAN Bennion2 |
| 1Department of Optoelectronic Engineering, Chongqing
University, Chongqing 400044
2Department of Electronic Engineering, Aston University, Birmingham B4 7ET, United Kingdom |
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| Cite this article: |
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RAO Yun-Jiang, ZENG Xiang-Kai, ZHU Yong et al 2001 Chin. Phys. Lett. 18 643-645 |
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Abstract A novel fibre-optic sensing system used for temperature-strain
discrimination is presented. This system consists of an extrinsic Fabry-Perot interferometric sensor (EFPI) and a chirped in-fibre Bragg grating (CFBG) in series. The EFPI and the CFBG are wavelength-division-multiplexed (WDM) to provide strain and temperature information, respectively. The wavelength-shift of the CFBG induced by temperature change in the 1.55μm region is interrogated with an intensity-based scheme, allowing fast measurement of temperature. The cavity length change of the EFPI is measured in the 1.3μm region,
allowing strain to be measured without cross-talk from the temperature sensor, i.e. the CFBG. Experimental results show that the achieved accuracies for strain and temperature measurement are ±20 x 10-6 and ±2°C, respectively.
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| Keywords:
42.81.Pa
42.81.Cn
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Published: 01 May 2001
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| PACS: |
42.81.Pa
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(Sensors, gyros)
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42.81.Cn
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(Fiber testing and measurement of fiber parameters)
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